JPS5824026A - Construction of each pile for netted pile structure - Google Patents

Abstract

PURPOSE:To prevent the occurrence of landslide by forming a netted pile structure by a method in which a pipe whose lower end is opened is inserted into an excavated pit, iron bars are sent, and then cement mortar is poured, the pipe is drawn out, and then the supply of high-pressure air and cement mortar is repeatedly made. CONSTITUTION:A pipe 10 whose lower end is opened is inserted into an excavated pit, iron bars 15 are set, and then cement mortar 14 is poured into the pit. Then, the pipe 10 is pulled out by a given length and high-pressure air 20 is supplied from the hole 12 of a head 11 to form an expanded portion 18. When the level of the cement mortar 14 placed is lowered, the mortar is further supplied from the hole 12 of the head 11. Furthermore, the pipe 10 is drawn out by a given length and said processes are repeated to form a pile 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing each pile of a net-like pile structure consisting of a plurality of piles formed in the ground and a joined body joining the piles at one end.

For example, as shown in Fig. 1, the net-like pile structure is a structure in which a plurality of piles f31 + 3) are formed in the ground G by penetrating the sliding surface S of the ground G in order to prevent landslides on slopes. .

Net-like pile structure +1+ pile (3) (3)... forms a three-dimensional or +42-dimensional structure, for example, as shown in Fig. 2, the pile +3+ +3 spreads outward and slopes to one side.
+...Make the column plural.

Each pile (3) of the net-like pile structure f1) has a smaller diameter than a general on-site construction pile, and sufficient consideration must be given to the connection with the soil.

The object of the present invention is to provide a construction method for each pile that solves this problem for a net-like pile structure.

A construction method for each pile of the net-like pile structure of the present invention will be described below according to an embodiment shown in the drawings.

Figure 3 shows that after the excavation process, a pipe (lO) with an open bottom end is inserted into a hole made in the ground G through the joint (2), reinforcing bars (I5) are inserted, and mortar (14) is injected. Indicates the condition.

The holes are generally inclined with respect to the joint (2), but for simplicity the holes are shown vertically.

This pipe (10) may be used in conjunction with gauging for excavation.

The north end of the pipe (10) has a head (12) with a hole (12).
II) is installed.

Next, as shown in FIG. 4, the pipe (10) is pulled out by a predetermined length.

Next, as shown in FIG. 5, high pressure air (20) is supplied into the pipe (10) from the hole (12) of the head (11).

As a result, the mortar (14) is exposed by pulling out the pipe (10), and the ground G is exposed from the wall and bottom of the hole.
It penetrates inside and forms an expanded portion (18).

As a result, the level of the mortar (4) decreases, so mortar (14) 1 is replenished from the hole (12) of the head (11) as shown in FIG.

Next, as shown in FIG. 7, the pipe (10) is further pulled out by a predetermined length, and the steps shown in FIGS. 4 to 6 are repeated.

As a result, the mortar (14) penetrates into the exposed wall of the hole one after another, and finally, as shown in Figure 8, a pile (3) having an expanded part (18) that digs into the ground G is formed. The construction method for each pile of the Noh net-like pile structure of the invention is shown below.

That is, as shown in FIG. 9, particularly high pressure air (20) is supplied into the pipe (10) when the pipe (10) is first pulled out.

This forms a large expansion part (19), but the air pressure supplied after the subsequent drawing process is lower than the initial pressure.

That is, as shown in FIG. 10, an expanded portion (18) smaller than the first expanded portion (19) is formed.

By this method, finally 1-1: a pile (3) having a step-like expansion part (+s) (19) with a large lower part as shown in FIG. 11 is formed.

Next, if the air pressure is particularly high for the first certain distance of pulling out, and then the air pressure is lowered thereafter, a step-like expansion part (18) (pile (3) having lqf as shown in Fig. 12) is created. It is also possible to form

Furthermore, as another construction method of the present invention, as shown in FIG. 13, about half of the mortar (14) is injected and air pressure is applied to form and harden the expanded part (18), and then the remaining mortar ( 14) is injected and a higher air pressure is applied, it is also possible to form a pile (3) having a step-like expansion part ++s)(+1 as shown in FIG. 14).

The construction method for each pile of the net-like pile structure of the present invention has the following effects in the above configuration.

(1) The method for constructing each pile of the reticulated pile structure of the present invention includes the steps of inserting a pipe (lO) with an open bottom end after the excavation step, inserting reinforcing bars (15), and injecting mortar (14); After removing the pipe (lO), high pressure air (
20) and replenishment of mortar (14) are repeated to infiltrate the mortar (14) into the ground G,
In particular, the mortar (14) is ground G due to high pressure air (20).
(18) (1)
1(+9) (a pile (3) with +1 is formed,
As a result, the pile (3) of the net-like pile structure with a small diameter is sufficiently connected to the ground G, and landslides can be effectively prevented.

(2) The construction method for each pile of the reticulated pile structure of the present invention has the same configuration as above, and when the supplied air pressure is changed, the step-like expansion part (18) (1 m (+9) (ag
As a result, a pile (3) is formed which can effectively support tensile force and compressive force +31...
It becomes possible to provide a net-like pile structure having the following properties.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing an example of a net-like pile structure. FIG. 2 is a perspective view of the same as above. FIGS. 3 to 8 are explanatory diagrams of the construction method of the present invention. An explanatory diagram of the construction method. FIG. 12 is a cross-sectional front view of a pile formed by another construction method of the present invention. FIGS. 13 and 14 are explanatory diagrams of another construction method of the present invention. 1: Reticular pile structure 2: Joined body 3: pile
IO = pipe 11: head 1
2: Hole 14: Mortar 15: Rebar 18.18'
, 19, 19': Expansion section 20: Air G: Ground
S: Sliding surface Applicant: Hirose Kozai Sangyo Co., Ltd. Figure 12 (Figure 3■

Claims (1)

[Claims] 1. After the excavation step, a step of inserting a pipe (10) whose lower end is open, inserting reinforcing bars (15) and injecting mortar (14), and after this step, pulling out the pipe (10); Construction method 2 for each pile of a net-like pile structure consisting of the steps of repeatedly supplying high-pressure air (20) and replenishing mortar (14) to infiltrate the mortar (14) into the ground G, a patent that changes the supplied air pressure A method for constructing each pile of the reticulated pile structure according to claim 1.